Mono track plays left only, despite having pan set to centre. This is not a "feature" nor is it correct behaviour. It is a bug. It was introduced in 6.xx
All other application tested play mono track equally left/right unless explicitly told not to. They do not make arbitrary decisions.
Changing the audio pan in VideoPad makes no difference. Mono remains left channel only.
"In mono, only one loudspeaker is necessary, but, when played through multiple loudspeakers or headphones, identical signals are fed to each speaker, resulting in the perception of one-channel sound "imaging" in one sonic space between the speakers."